Bio-information estimation apparatus, and apparatus and method for spectrum quality assessment

Abstract

A spectrum quality assessment apparatus includes a spectrum obtainer configured to obtain a skin spectrum; and a processor configured to assess a quality of the obtained skin spectrum based on at least one of a light intensity of the obtained skin spectrum, an absorbance with respect to a wavelength of the obtained skin spectrum, a spectrum reconstructed based on a skin composition spectrum, and a similarity between a reference skin spectrum and the obtained skin spectrum.

What is claimed is: 
     
         1 . A spectrum quality assessment apparatus, comprising:
 a spectrum obtainer configured to obtain a skin spectrum; and   a processor configured to assess a quality of the obtained skin spectrum based on at least one of a light intensity of the obtained skin spectrum, an absorbance with respect to a wavelength of the obtained skin spectrum, a spectrum reconstructed based on a skin composition spectrum, and a similarity between a reference skin spectrum and the obtained skin spectrum.   
     
     
         2 . The apparatus of  claim 1 , wherein the obtained skin spectrum comprises a skin near-infrared absorption spectrum. 
     
     
         3 . The apparatus of  claim 1 , wherein in response to the light intensity in at least one from among a wavelength region of 4000 cm −1  to 4150 cm −1  and a wavelength region of 4960 cm −1  to 5280 cm −1  of the obtained skin spectrum exceeding a predetermined threshold, the processor is configured to determine that the obtained skin spectrum is distorted. 
     
     
         4 . The apparatus of  claim 1 , wherein the processor is configured to obtain a water path length based on a change in the absorbance with respect to the wavelength of the obtained skin spectrum and a reference absorbance with respect to a wavelength of a spectrum predetermined according to a center distance between a light source and a light detector, and in response to the obtained water path length being less than a predetermined value, the processor is configured to determine that the obtained skin spectrum is distorted. 
     
     
         5 . The apparatus of  claim 1 , wherein the processor is configured to reconstruct the spectrum based on the skin composition spectrum, and in response to a difference in the absorbance between the obtained skin spectrum and the reconstructed spectrum exceeding a predetermined threshold, the processor is configured to determine that the obtained skin spectrum is distorted. 
     
     
         6 . The apparatus of  claim 5 , wherein the processor is configured to generate the reconstructed spectrum by using a Classical Least square (CLS) algorithm. 
     
     
         7 . The apparatus of  claim 1 , wherein the processor is configured to obtain the similarity between the obtained skin spectrum and the reference skin spectrum according to a change of the absorbance with respect to the wavelength, and in response to the similarity being less than a predetermined threshold, the processor is configured to determine that the obtained skin spectrum is distorted. 
     
     
         8 . The apparatus of  claim 1 , wherein the spectrum obtainer comprises a light source configured to emit light to a subject, and a light detector configured to detect light reflected or scattered from the subject. 
     
     
         9 . The apparatus of  claim 7 , further comprising an output part configured to output at least one from among a result of quality assessment of the obtained skin spectrum and guide information to correct distortion of the obtained skin spectrum. 
     
     
         10 . A bio-information estimation apparatus, comprising:
 a spectrum obtainer comprising a light source configured to emit light to a subject, and a light detector configured to detect light reflected or scattered from the subject; and   a processor configured to determine a degree of distortion of an obtained skin spectrum, and to estimate bio-information based on a valid skin spectrum determined according to the degree of distortion.   
     
     
         11 . The apparatus of  claim 10 , wherein the processor is configured to determine the degree of distortion of the obtained skin spectrum based on at least one from among a light intensity of the obtained skin spectrum, an absorbance with respect to a wavelength, a spectrum reconstructed based on a skin composition spectrum, and a similarity between a reference skin spectrum and the obtained skin spectrum. 
     
     
         12 . The apparatus of  claim 11 , wherein in response to determining that the obtained skin spectrum is not valid according to the degree of distortion, the processor is configured to control the spectrum obtainer to re-obtain a skin spectrum. 
     
     
         13 . The apparatus of  claim 12 , wherein the processor is configured to generate guide information to correct at least one from among a state of a contact between the spectrum obtainer and the subject and a measurement position of the spectrum obtainer with respect to the subject according to the degree of distortion of the obtained skin spectrum. 
     
     
         14 . The apparatus of  claim 10 , wherein the processor is configured to estimate bio-information by using a bio-information correlation model pre-generated based on the valid skin spectrum. 
     
     
         15 . A spectrum quality assessment method, comprising:
 obtaining a skin spectrum; and   assessing a quality of the obtained skin spectrum based on at least one from among a light intensity of the obtained skin spectrum, an absorbance with respect to a wavelength of the obtained skin spectrum, a spectrum reconstructed based on a skin composition spectrum, and a similarity between a reference skin spectrum and the obtained skin spectrum.   
     
     
         16 . The method of  claim 15 , wherein the obtained skin spectrum comprises a skin near-infrared absorption spectrum. 
     
     
         17 . The method of  claim 15 , wherein the assessing comprises determining that the obtained skin spectrum is distorted in response to the light intensity in at least one from among a wavelength region of 4000 cm −1  to 4150 cm −1  and a wavelength region of 4960 cm −1  to 5280 cm −1  of the obtained skin spectrum exceeding a predetermined threshold. 
     
     
         18 . The method of  claim 15 , wherein the assessing comprises:
 obtaining a water path length based on a change in the absorbance with respect to the wavelength of the obtained skin spectrum and a reference absorbance with respect to a wavelength of a spectrum predetermined according to a center distance between a light source and a light detector; and   in response to the water path length being less than a predetermined value, determining that the obtained skin spectrum is distorted.   
     
     
         19 . The method of  claim 15 , wherein the assessing comprises:
 generating the spectrum reconstructed based on the skin composition spectrum; and   in response to a difference in the absorbance between the obtained skin spectrum and the reconstructed spectrum exceeding a predetermined threshold, determining that the obtained skin spectrum is distorted.   
     
     
         20 . The method of  claim 15 , wherein the assessing comprises:
 obtaining the similarity between the obtained skin spectrum and the reference skin spectrum according to a change of the absorbance with respect to the wavelength; and   in response to the similarity being less than a predetermined threshold, determining that the obtained skin spectrum is distorted.